Merge pull request #1068 from reactjs/dependabot/npm_and_yarn/test/dummy_webpacker3/webpack-dev-server-3.1.11

Bump webpack-dev-server from 2.11.5 to 3.1.11 in /test/dummy_webpacker3

Author: BookOfGreg

test/dummy_webpacker3/package.json

@@ -9,6 +9,6 @@
     "react_ujs": "^2.2.1"
   },
   "devDependencies": {
-    "webpack-dev-server": "^2.7.1"
+    "webpack-dev-server": "^3.1.11"
   }
 }